Excel “External table is not in the expected format.”

Question:

I'm trying to read an Excel (xlsx) file using the code shown below. I get an "External table is not in the expected format." error unless I have the file already open in Excel. In other words, I have to open the file in Excel first before I can read if from my C# program. The xlsx file is on a share on our network. How can I read the file without having to open it first? Thanks

 

 

string sql = "SELECT * FROM [Sheet1$]"; 
string excelConnection = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathname + ";Extended Properties=\"Excel 8.0;HDR=YES;IMEX=1;\""; 
 
using (OleDbDataAdapter adaptor = new OleDbDataAdapter(sql, excelConnection)) { 
    DataSet ds = new DataSet(); 
    adaptor.Fill(ds); 
} 
 

 

 

Answers:

"External table is not in the expected format." typically occurs when trying to use an Excel 2007 file with a connection string that uses: Microsoft.Jet.OLEDB.4.0 and Extended Properties=Excel 8.0

Using the following connection string seems to fix most problems.

 

 

public static string path = @"C:\src\RedirectApplication\RedirectApplication\301s.xlsx"; 
public static string connStr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 12.0;";